function menuOver(id) {
  var obj1=document.getElementById(id);
  var arrow=document.images[id+'_arrow'];
  if(obj1.className=='menuBase') {
    obj1.className='menuOver';
    if(arrow) {
      arrow.src=menuArrowRtOver.src;
    }
  }
  else if(obj1.className=='menuSelect') {
    obj1.className='menuSelectOver';
    if(arrow) {
      arrow.src=menuArrowUpOver.src;
    }
  }
}
function menuOut(id) {
  var obj1=document.getElementById(id);
  var arrow=document.images[id+'_arrow'];
  if( obj1.className=='menuOver') {
    obj1.className='menuBase';
    if(arrow) {
      arrow.src=menuArrowRt.src;
    }
  }
  else if(obj1.className=='menuSelectOver') {
    obj1.className='menuSelect';
    if(arrow) {
      arrow.src = menuArrowDn.src;
    }
  }
}